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Reassembling Pieces Into Objects - 2nd Grade Science

  1. Original: a tangram cat made from 7 pieces. New: same 7 pieces make a house. What stayed the same?
    Answer: The cat and house use the same 7 tangram pieces. This question assesses the skill 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new, with the important idea being the same pieces in a different arrangement, without adding or removing any—we just move them to different positions, showing that pieces can be used in many ways. The original object was a tangram cat made of 7 pieces, and the same 7 pieces were taken apart and rearranged to make a house; counting shows the cat had 7 pieces and the house also has 7 pieces—the same number and same pieces, but with a changed arrangement and shape. The correct answer is A because it correctly identifies that the same 7 tangram pieces were used in both objects, just rearranged with no pieces added or taken away; students who observe carefully can see the same count and same shapes in both. Distractor B is incorrect because it claims the house uses 10 pieces, which is wrong as the number stayed the same—this error happens when students don't count accurately or focus on appearance. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like tangrams, counting at each stage: 'How many pieces in the cat? Now take apart. How many? Now make a house. How many?'—it's the same number! Use 'Same/Different' charts to note what's same (pieces, number, shapes) versus different (arrangement, what it looks like), and emphasize that matter doesn't disappear or appear—it just moves.
  2. Eight triangle tiles made a flat star, then a pyramid. What stayed the same?
    Answer: The same 8 triangle tiles were used This question tests understanding of 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and REARRANGED to make something new. The important idea: SAME pieces, DIFFERENT arrangement. We don't add new pieces or take pieces away—we just move them to different positions. The pieces stay the same, but what they make changes. This shows that pieces can be used in many ways. The original object was a flat star made of 8 triangle tiles. The same pieces were taken apart and rearranged to make a pyramid. Count the pieces: the star had 8 triangle tiles; the pyramid also has 8 triangle tiles—SAME number, SAME pieces. What changed: the arrangement from flat to 3D, position, and shape of the final object. The correct answer is A because it correctly identifies that the SAME 8 triangle tiles were used in both objects. No pieces were added or taken away. Students who observe carefully can see that the same 8 triangles appear in both the flat star and pyramid. The pieces were just moved to different positions. Choice B is incorrect because it claims four new tiles were added. Choice C wrongly states some tiles were removed to help it stand. Choice D incorrectly suggests the tiles turned into squares. These errors happen when students think making a 3D shape requires more pieces or believe pieces physically change shape. To help students understand reassembly: Have students physically build, take apart, and rebuild with same pieces (pattern blocks or tiles are perfect for this). Count pieces at each stage—'How many triangles in the star? Now take it apart. How many triangles? Now make a pyramid. How many triangles?'—SAME number! Use language precisely: 'Rearrange' = move pieces, 'Add' = new pieces, 'Remove' = take away pieces. Make 'Same/Different' charts: What's SAME (pieces, number, shape of pieces) vs What's DIFFERENT (flat vs 3D, arrangement). Emphasize conservation: Matter doesn't disappear or appear; it just moves. Show transformation series: 8 triangles → flat star → take apart → rearrange → pyramid (same 8 triangles). Watch for: Students who think making 3D shapes requires more pieces, believe pieces change shape, or don't count pieces in both objects.
  3. Sofia made a LEGO car, then took it apart and made an airplane. What happened to the pieces?
    Answer: The same pieces were used again, just rearranged. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, Sofia's original object was a LEGO car made of certain pieces, which she took apart and rearranged using the same pieces to make an airplane; the pieces remain identical in number and type, with only their configuration changed. The correct answer is B because it correctly explains that the same pieces were used again, just rearranged, with no losses or additions, and verification comes from noting all original pieces are present. Distractor A is incorrect because it claims some pieces were lost, leading to fewer, but all are reused, an error when students think disassembly means removal without checking. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.
  4. A car made of LEGO pieces became an airplane. Which is true?
    Answer: The same LEGO pieces were moved to new spots This question tests understanding of 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and REARRANGED to make something new. The important idea: SAME pieces, DIFFERENT arrangement. We don't add new pieces or take pieces away—we just move them to different positions. The pieces stay the same, but what they make changes. This shows that pieces can be used in many ways. The original object was a car made of LEGO pieces. The same pieces were taken apart and rearranged to make an airplane. Count the pieces: the car had a specific number of LEGO pieces; the airplane has the SAME number of pieces—SAME pieces. What changed: the arrangement, position, and shape to create a different vehicle. The correct answer is A because it correctly identifies that the SAME LEGO pieces were used in both objects, just moved to new spots. No pieces were added or taken away. Students who observe carefully can see that the same LEGO pieces appear in both the car and airplane. The pieces were just moved to different positions. Choice B is incorrect because it claims two new wheels were added, but we're using the same pieces. Choice C wrongly states pieces were thrown away. Choice D incorrectly suggests the pieces physically turned into different pieces. These errors happen when students think making something new requires new pieces or don't recognize the same pieces in different arrangements. To help students understand reassembly: Have students physically build, take apart, and rebuild with same pieces (LEGO blocks are perfect for this). Count pieces at each stage—'How many pieces in the car? Now take it apart. How many pieces? Now make an airplane. How many pieces?'—SAME number! Use language precisely: 'Rearrange' = move pieces, 'Add' = new pieces, 'Remove' = take away pieces. Make 'Same/Different' charts: What's SAME (pieces, number, colors) vs What's DIFFERENT (shape, arrangement, what it looks like). Emphasize conservation: Matter doesn't disappear or appear; it just moves. Show transformation series: LEGO car → take apart → rearrange → airplane (same pieces). Watch for: Students who think rearranging means pieces changed, believe making something new requires new pieces, or don't recognize the same pieces in both objects.
  5. A puzzle dog used 6 pieces. The same 6 pieces make a tree. Which is true?
    Answer: The same 6 pieces were rearranged into a new picture. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, the original object was a puzzle dog made of 6 pieces, and the same 6 pieces were taken apart and rearranged to make a tree; both use exactly 6 pieces, with the transformation in their positioning to form a new picture. The correct answer is B because it correctly states that the same 6 pieces were rearranged into a new picture, with no additions or removals, and counting confirms this. Distractor A is incorrect because it claims new pieces were added, but the count is unchanged, an error when students don't count and assume differences mean additions. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.
  6. Original: a castle built with 10 blocks. New: same 10 blocks make a house. Which is true?
    Answer: The same 10 blocks were rearranged to make a house. This question assesses the skill 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new, with the important idea being the same pieces in a different arrangement, without adding or removing any—we just move them to different positions, showing that pieces can be used in many ways. The original object was a castle made of 10 blocks, and the same 10 blocks were taken apart and rearranged to make a house; counting shows the castle had 10 pieces and the house also has 10 pieces—the same number and same pieces, but with a changed arrangement and shape. The correct answer is B because it correctly identifies that the same 10 blocks were used in both objects, just rearranged with no pieces added or taken away; students who observe carefully can see the same count and same blocks in both. Distractor A is incorrect because it claims the house used different blocks, which is wrong as they are the same—this error happens when students don't recognize the transformation or focus only on the final appearance. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage: 'How many blocks in the castle? Now take apart. How many? Now make a house. How many?'—it's the same number! Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), and emphasize that matter doesn't disappear or appear—it just moves.
  7. A tower of 6 blocks was changed into a bridge. What stayed the same?
    Answer: The same 6 blocks were used, just rearranged This question tests understanding of 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and REARRANGED to make something new. The important idea: SAME pieces, DIFFERENT arrangement. We don't add new pieces or take pieces away—we just move them to different positions. The pieces stay the same, but what they make changes. This shows that pieces can be used in many ways. The original object was a tower made of 6 blocks. The same pieces were taken apart and rearranged to make a bridge. Count the pieces: the tower had 6 blocks; the bridge also has 6 blocks—SAME number, SAME pieces. What changed: the arrangement, position, and shape of the final object. The correct answer is B because it correctly identifies that the SAME 6 blocks were used in both objects, just rearranged. No pieces were added or taken away. Students who observe carefully can see that the same count and same blocks appear in both objects. The pieces were just moved to different positions. Choice A is incorrect because it claims blocks were taken away, but we still have 6 blocks. Choice C incorrectly states new blocks were added. Choice D wrongly suggests the blocks physically changed shape. These errors happen when students don't count pieces in both objects or confuse appearance change with physical change. To help students understand reassembly: Have students physically build, take apart, and rebuild with same pieces (blocks are perfect for this). Count pieces at each stage—'How many blocks in the tower? Now take it apart. How many blocks? Now make a bridge. How many blocks?'—SAME number! Use language precisely: 'Rearrange' = move pieces, 'Add' = new pieces, 'Remove' = take away pieces. Make 'Same/Different' charts: What's SAME (pieces, number, colors) vs What's DIFFERENT (shape, arrangement, what it looks like). Emphasize conservation: Matter doesn't disappear or appear; it just moves. Show transformation series: 6 blocks → tower → take apart → rearrange → bridge (same 6 blocks). Watch for: Students who think rearranging means pieces changed, believe appearance change means physical change, or don't count pieces in both objects.
  8. Look at the tower and the bridge. What stayed the same about the pieces?
    Answer: The same 6 blocks were used, just arranged differently. This question assesses the skill 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new, with the important idea being the same pieces in a different arrangement, without adding or removing any—we just move them to different positions, showing that pieces can be used in many ways. The original object was a tower made of 6 blocks, and the same 6 blocks were taken apart and rearranged to make a bridge; counting shows the tower had 6 pieces and the bridge also has 6 pieces—the same number and same pieces, but with a changed arrangement and shape. The correct answer is A because it correctly identifies that the same 6 blocks were used in both objects, just arranged differently with no pieces added or taken away; students who observe carefully can see the same count and same blocks in both. Distractor B is incorrect because it claims there are more blocks in the bridge, which is wrong as the number stayed the same—this error happens when students focus only on appearance or don't count the pieces accurately. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage: 'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—it's the same number! Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), and emphasize that matter doesn't disappear or appear—it just moves.
  9. A LEGO car was taken apart and made into an airplane. What is the same?
    Answer: The pieces are the same, but they are in new places. This question assesses the skill 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new, with the important idea being the same pieces in a different arrangement, without adding or removing any—we just move them to different positions, showing that pieces can be used in many ways. The original object was a LEGO car made of certain pieces, and the same pieces were taken apart and rearranged to make an airplane; the pieces remain the same in number and type, but with a changed arrangement and shape. The correct answer is A because it correctly identifies that the same pieces were used in both objects, just in new places with no pieces added or taken away; students who observe carefully can see the same pieces repositioned. Distractor C is incorrect because it claims the wheels turned into wings by changing shape, which is wrong as pieces don't physically change—this error happens when students confuse appearance with physical transformation. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like LEGO, counting at each stage: 'How many pieces in the car? Now take apart. How many? Now make an airplane. How many?'—it's the same number! Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), and emphasize that matter doesn't disappear or appear—it just moves.
  10. Original: a LEGO car. New: the same LEGO pieces make an airplane. What stayed the same?
    Answer: The same LEGO pieces were used, just moved around. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, the original object was a LEGO car made of certain LEGO pieces, and the same pieces were taken apart and rearranged to make an airplane; the transformation keeps the same number and type of pieces, with the change being their positions and the resulting object. The correct answer is A because it correctly identifies that the same LEGO pieces were used, just moved around, with no additions or changes, and students can verify by noting the pieces match in both builds. Distractor B is incorrect because it claims new wheels were added, but no new pieces were introduced, an error occurring when students focus only on appearance changes without checking the pieces themselves. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.
  11. Original: 6 blocks stacked tall. New: the same 6 blocks in a line. What happened to the pieces?
    Answer: The same blocks were rearranged into a different shape. This question assesses the skill 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new, with the important idea being the same pieces in a different arrangement, without adding or removing any—we just move them to different positions, showing that pieces can be used in many ways. The original object was 6 blocks stacked tall, and the same 6 blocks were taken apart and rearranged to make a line; counting shows the stacked version had 6 pieces and the line also has 6 pieces—the same number and same pieces, but with a changed arrangement and shape. The correct answer is B because it correctly identifies that the same blocks were used in both objects, just rearranged with no pieces added or taken away; students who observe carefully can see the same count and same blocks in both. Distractor A is incorrect because it claims new blocks were added, which is wrong as no pieces were added—this error happens when students don't count the pieces or confuse a shape change with adding pieces. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage: 'How many blocks stacked? Now take apart. How many? Now make a line. How many?'—it's the same number! Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), and emphasize that matter doesn't disappear or appear—it just moves.
  12. Seven tangram pieces made a house after making a cat. What is different?
    Answer: The same pieces are arranged in a new way This question tests understanding of 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and REARRANGED to make something new. The important idea: SAME pieces, DIFFERENT arrangement. We don't add new pieces or take pieces away—we just move them to different positions. The pieces stay the same, but what they make changes. This shows that pieces can be used in many ways. The original object was a cat made of 7 tangram pieces. The same pieces were taken apart and rearranged to make a house. Count the pieces: the cat had 7 tangram pieces; the house also has 7 tangram pieces—SAME number, SAME pieces. What changed: the arrangement and position to create a different picture. The correct answer is C because it correctly identifies that the SAME pieces are arranged in a new way. No pieces were added or taken away. Students who observe carefully can see that the same 7 tangram pieces appear in both objects. The pieces were just moved to different positions. Choice A is incorrect because it claims different pieces were used. Choice B wrongly states the number changed from 7 to 5. Choice D incorrectly suggests new pieces were added to make it taller. These errors happen when students don't recognize the same pieces in different arrangements or don't count carefully. To help students understand reassembly: Have students physically build, take apart, and rebuild with same pieces (tangrams are perfect for this). Count pieces at each stage—'How many pieces in the cat? Now take it apart. How many pieces? Now make a house. How many pieces?'—SAME number! Use language precisely: 'Rearrange' = move pieces, 'Add' = new pieces, 'Remove' = take away pieces. Make 'Same/Different' charts: What's SAME (pieces, number, shapes) vs What's DIFFERENT (arrangement, what it looks like). Emphasize conservation: Matter doesn't disappear or appear; it just moves. Show transformation series: 7 tangrams → cat → take apart → rearrange → house (same 7 pieces). Watch for: Students who think different pictures need different pieces, miscount pieces, or don't recognize the same pieces in both objects.
  13. A tangram cat was taken apart and made into a tangram house. Which is true?
    Answer: The same 7 tangram pieces were rearranged to make a house. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, the original object was a tangram cat made of 7 pieces, and the same 7 pieces were taken apart and rearranged to make a tangram house; counting shows the cat had 7 pieces and the house also has 7—the same number and same pieces, with the change in arrangement creating a new shape. The correct answer is B because it correctly states that the same 7 tangram pieces were rearranged, with no additions or removals, and students can confirm by counting and matching the pieces. Distractor A is incorrect because it claims the house used 10 pieces instead of 7, which is wrong as the count remains the same, an error when students don't count pieces in both and assume a different look means more pieces. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.
  14. A tower of 6 blocks became a bridge. What happened to the blocks?
    Answer: The blocks stayed the same, but were rearranged This question tests understanding of 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and REARRANGED to make something new. The important idea: SAME pieces, DIFFERENT arrangement. We don't add new pieces or take pieces away—we just move them to different positions. The pieces stay the same, but what they make changes. This shows that pieces can be used in many ways. The original object was a tower made of 6 blocks. The same pieces were taken apart and rearranged to make a bridge. Count the pieces: the tower had 6 blocks; the bridge also has 6 blocks—SAME number, SAME pieces. What changed: the arrangement, position, and shape of the final structure. The correct answer is A because it correctly identifies that the blocks stayed the same but were rearranged. No pieces were added or taken away. Students who observe carefully can see that both structures have exactly 6 blocks. The pieces were just moved to different positions. Choice B is incorrect because it claims blocks melted and changed shape, but blocks don't melt. Choice C wrongly states three blocks were removed. Choice D incorrectly suggests new blocks were added under the bridge. These errors happen when students think blocks can physically change or don't count pieces in both objects. To help students understand reassembly: Have students physically build, take apart, and rebuild with same pieces (blocks are perfect for this). Count pieces at each stage—'How many blocks in the tower? Now take it apart. How many blocks? Now make a bridge. How many blocks?'—SAME number! Use language precisely: 'Rearrange' = move pieces, 'Add' = new pieces, 'Remove' = take away pieces. Make 'Same/Different' charts: What's SAME (pieces, number, material) vs What's DIFFERENT (shape, arrangement, function). Emphasize conservation: Matter doesn't disappear or appear; it just moves. Show transformation series: 6 blocks → tower → take apart → rearrange → bridge (same 6 blocks). Watch for: Students who think blocks can melt or change shape, believe making bridges requires support blocks, or don't count pieces in both objects.
  15. Original: 8 magnetic triangles make a flat star. New: the same 8 triangles make a pyramid. What happened?
    Answer: The same 8 triangles were moved to make a new shape. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, the original object was a flat star made of 8 magnetic triangles, and the same 8 triangles were taken apart and rearranged to make a pyramid; the count remains 8 triangles in both, with the transformation from flat to 3D via repositioning. The correct answer is A because it correctly explains that the same 8 triangles were moved to make a new shape, with no changes to the pieces themselves, and careful observation shows the same count and pieces. Distractor B is incorrect because it claims four new triangles were added, but the number is unchanged at 8, an error from not counting and assuming a new shape requires additions. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.
  16. Jamal stacked 6 blocks into a tower, then made a bridge. What changed?
    Answer: The blocks were arranged in a different way. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, the original object was a tower stacked from 6 blocks by Jamal, then taken apart and rearranged into a bridge; the same 6 blocks are used, with the change solely in their arrangement from vertical to horizontal. The correct answer is A because it correctly identifies that the blocks were arranged in a different way, with no new blocks or changes, and observation shows the same pieces repositioned. Distractor B is incorrect because it claims more blocks were added, but the count remains 6, an error from thinking a new shape requires extras without verifying. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.
  17. Look at the tangram cat and tangram house. Were any pieces added or taken away?
    Answer: No, the same 7 pieces were just rearranged. This question assesses the skill 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new, with the important idea being the same pieces in a different arrangement, without adding or removing any—we just move them to different positions, showing that pieces can be used in many ways. The original object was a tangram cat made of 7 pieces, and the same 7 pieces were taken apart and rearranged to make a house; counting shows both had 7 pieces—the same number and same pieces, but with a changed arrangement and shape. The correct answer is C because it correctly identifies that the same 7 pieces were used in both objects, just rearranged with no pieces added or taken away; students who observe carefully can see no additions or removals. Distractor A is incorrect because it claims 1 new piece was added, which is wrong as no pieces were added—this error happens when students don't count or think new shapes need new parts. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like tangrams, counting at each stage: 'How many pieces in the cat? Now take apart. How many? Now make a house. How many?'—it's the same number! Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), and emphasize that matter doesn't disappear or appear—it just moves.
  18. Original: a tall tower of 6 blocks. New: the same 6 blocks make a bridge. Were any new pieces added?
    Answer: No, the same 6 blocks were just rearranged. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, the original object was a tall tower made of 6 blocks, and the same 6 blocks were taken apart and rearranged to make a bridge; counting the pieces, the tower had 6 blocks and the bridge also has 6 blocks—the same number and same pieces, with the change being the arrangement and shape. The correct answer is B because it correctly identifies that no new pieces were added and the same 6 blocks were just rearranged, with students observing the same count in both to see no additions occurred. Distractor A is incorrect because it claims two more blocks were added, which is wrong as the piece count remains 6, an error that happens when students don't count the pieces in both objects and assume a different shape means additions. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.
  19. Original: 8 magnetic triangles made a star. New: a pyramid. Were any pieces removed?
    Answer: No, the same 8 triangles were used in a new way. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, the original object was a star made of 8 magnetic triangles, and the same 8 triangles were rearranged to make a pyramid; no pieces were removed, as the count stays 8, with the change in arrangement from 2D to 3D. The correct answer is B because it correctly states no pieces were removed and the same 8 were used in a new way, with students able to count to confirm. Distractor A is incorrect because it claims three triangles were removed, but the number is the same, an error from assuming a new shape means fewer pieces without counting. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.
  20. Original: 6 blocks (2 red, 2 blue, 2 yellow) made a tower. New: a bridge. Which is true?
    Answer: The bridge uses 6 blocks with the same colors. This question assesses the skill 2-PS1-3: Reassembling the same pieces to make a new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new; the important idea is using the same pieces in a different arrangement without adding or removing any, just moving them to different positions, so the pieces stay the same but the final object changes, showing pieces can be used in many ways. In this stimulus, the original object was a tower made of 6 blocks (2 red, 2 blue, 2 yellow), and the same 6 blocks with the same colors were rearranged to make a bridge; the count and colors match exactly, with only the arrangement differing. The correct answer is A because it correctly identifies that the bridge uses 6 blocks with the same colors, emphasizing conservation of pieces, and students can check colors and count. Distractor B is incorrect because it claims 8 blocks with extra red ones, but it's the same 6 with original colors, an error from not verifying details. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage—'How many blocks in the tower? Now take it apart. How many? Now make a bridge. How many?'—showing the number stays the same. Use 'Same/Different' charts to note what's same (pieces, number, colors) versus different (shape, arrangement), emphasizing that matter doesn't disappear or appear but just moves, and practice with clear transformations using tangrams or blocks.

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